The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 2002
Filed:
Apr. 17, 2001
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In order to avoid damages or deformations to ejection energy generating elements formed on a substrate or grooved plate, when the substrate and the grooved plate are joined, a liquid ejection head for an image forming apparatus includes a substrate having electro-thermal energy conversion elements thereon, a grooved plate having grooves formed at positions corresponding to the electro-thermal energy conversion elements, ejection ports communicating with the respective grooves, and liquid paths communicating with the ejection ports. At least two protrusions are formed on the substrate apart from each other and corresponding engaging recessed portions are formed on the grooved plate for engaging the protrusions. A height from the surface of the substrate to upper ends of the protrusions is set higher than a height from the surface of the substrate to upper ends of the electro-thermal energy conversion elements or other micro processed portions.